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  • Title: Variability of the center of pressure pattern integral during walking.
    Author: McPoil TG, Cornwall MW.
    Journal: J Am Podiatr Med Assoc; 1998 Jun; 88(6):259-67. PubMed ID: 9642906.
    Abstract:
    The objective of this study was to measure the between-trial variability of the center of pressure pattern integral (COPPI) at the shoe-floor interface and within the shoe. Ten trials of the COPPI were recorded simultaneously at the shoe-floor interface and within the shoe as ten subjects walked over ground in standardized footwear and with two types of foot orthoses. While the results showed that the within-shoe shoe-only and soft orthoses conditions caused the greatest decrease in the COPPI, it was extremely inconsistent-between trials, whether measured at the shoe-floor interface or within the shoe. This suggests that the COPPI is not an acceptable method of assessing the effectiveness of foot orthoses.
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